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http://dx.doi.org/10.9726/kspse.2017.21.6.005

Numerical Analysis on the Internal Flow Field Characteristics of Wind Tunnel According to Contraction Type  

Kim, Jang-Kweon (Dept. of Power System Engineering, Kunsan National University)
Oh, Seok-Hyung (School of Mechanical Engineering, Kunsan National University)
Publication Information
Journal of Power System Engineering / v.21, no.6, 2017 , pp. 5-12 More about this Journal
Abstract
The steady-state, incompressible and three-dimensional numerical analysis was carried out to investigate the internal flow fields characteristics according to wind tunnel contraction type. The turbulence model used in this study is a realizable $k-{\varepsilon}$ modified from the standard $k-{\varepsilon}$ model. As a results, the distribution of the axial mean velocity components along the central axis of the flow model is very similar to the ASME and BE types, and the cubic and cosine types. When the flow passes through the interior space of the analytical models, the flow resistance at the inlet of the plenum chamber is the largest at BS type contraction, but the smallest at cubic type contraction. The boundary layer thickness is the smallest in the cosine type contraction as the axial distance increases. The maximum turbulent kinetic energy in the test section is the smallest in the order of the contraction of cubic type and cosine type. Comprehensively, cubic type contraction is the best choice for wind tunnel performance, and cosine type contraction can be the next best solution.
Keywords
Boundary Layer Thickness; Contraction; Numerical Analysis; Subsonic Wind Tunnel;
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